tor 2002-10-17 klockan 17.32 skrev Simon Marlow:
> Note that Happy has support for some Haskellish things which you won't
> get if you use bison to generate Haskell. For example: type signatures
> on productions, and support for threading a monad around the parser.
Another feature which I would love to have in Happy is support for more
EBNF stuff, like repetition and alternative.
Repetition maps to Haskell lists and alternative maps to haskell Maybe.
Since there exists a transformation from EBNF to BNF this should be
possible. Also, the transformation can take certain things into account,
like that parsing a list of things is best done like this (due to the
parser being LALR)
list_of_things ::=
empty | list_of_things thing
instead of this more natural way
list_of_things
empty | thing list_of_things
Regards,
Martin
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